Electromagnetic induction heat generating roller, heating device, and image forming apparatus
First Claim
1. An electromagnetic induction heat generating roller comprising a core material, an elastic layer, an induction heat generating layer, and a mold releasing layer, which are provided outwardly in this order, wherein a magnetism shielding layer that prevents entry of magnetic flux into the core material is provided between the induction heat generating layer and the core material.
1 Assignment
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Accused Products
Abstract
An electromagnetic induced heating roller (21) comprises a core member (24), an elastic layer (23), induction heating layer (22), and a mold release layer in this order from inside to outside. Further, a magnetic shield layer for preventing a magnetic flux from penetrating into the core member (24) is interposed between the induction heating layer (22) and the core member (24). Out of an alternating magnetic field from a magnetic field generating means, a leakage flux having penetrated through the induction heating layer (22) is trapped by the magnetic shield layer. As a result, most of the impressed alternating magnetic flux is consumed for heating the heating layer (22), resulting in an improvement in the heating efficiency. A trouble is prevented which is generated by heating the bearing of the core member (24).
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Citations
28 Claims
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1. An electromagnetic induction heat generating roller comprising a core material, an elastic layer, an induction heat generating layer, and a mold releasing layer, which are provided outwardly in this order,
wherein a magnetism shielding layer that prevents entry of magnetic flux into the core material is provided between the induction heat generating layer and the core material.
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11. A heating device, comprising:
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an electromagnetic induction heat generating belt having an induction heat generating layer;
a supporting roller that is composed of a core material and a heat insulating layer provided on an outer side of the core material and makes contact internally with the electromagnetic induction heat generating belt so that the electromagnetic induction heat generating belt is supported rotatably;
a pressing roller that makes contact externally with the electromagnetic induction heat generating belt so that a nip part is formed between the pressing roller and the electromagnetic induction heat generating belt; and
a magnetic field generating unit that is disposed outside the electromagnetic induction heat generating belt and applies a magnetic field to the induction heat generating layer so that the induction heat generating layer generates heat by induction, wherein a material to be heated introduced into the nip part is conveyed under pressure by the electromagnetic induction heat generating belt and the pressing roller so as to be heated continuously, and in the supporting roller, a magnetism shielding layer that prevents entry of magnetic flux into the core material is provided on an outer side of the core material. - View Dependent Claims (12, 14)
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15. A heating device, comprising:
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an electromagnetic induction heat generating belt having an induction heat generating layer;
a metallic member that is disposed inside a loop of the electromagnetic induction heat generating belt;
a pressing roller that makes contact externally with the electromagnetic induction heat generating belt so that a nip part is formed between the pressing roller and the electromagnetic induction heat generating belt; and
a magnetic field generating unit that is disposed outside the loop of the electromagnetic induction heat generating belt and applies a magnetic field to the induction heat generating layer so that the induction heat generating layer generates heat by induction, wherein a material to be heated introduced into the nip part is conveyed under pressure by the electromagnetic induction heat generating belt and the pressing roller so as to be heated continuously, and a magnetism shielding member that prevents entry of magnetic flux into the metallic member further is provided between the electromagnetic induction heat generating belt and the metallic member. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification